Frequency division circuit



Feb. 7, 1933. R. M. PAGE 1,896,417

FREQUENCY DIVISION CIRCUIT Filed March 13, 1931 3 F i I g Q v v v u v "ET .l /c L/ Y g 1:2- E /5 4' lf /5 lj 5 k K L 'g k l Q i?? s E f/ f/e x 5 L S Q u Q Q m Q TUA/V6 407087/1/6/1/7 IIL VEN TOR.

ATTORNEY Patented Feb. 7, 1933 LUNITED s'ra'res,

PATENr OFFICE ROBERT M. PAGE, OF WASHINGTON, DISTRICT OF COLUMBIA.

FREQUENCY DIVISION CIRCUIT" applicati@ niet March 13, 1931. seriai No.l 522,436.

My invention relates broadly to high frequency circuitsv and more 'particularly toa frequency division circuit.

One of the Objects of my invention is to provide a stabilized arrangement Vof frequency division circuit whereby the frequency division circuit is'accurately controlledin operation for deriving a submultiple frequency from a predetermined applied fre-y quency.

Another object of my invention is to provide a circuit arrangement for a frequency division system wherein the operation of the systemis stabilized by thev association'o'f a condenser with the frequency determining resistance. 1

Other and further' objects of my invention reside in the circuit arrangement for a frequency division system as set forth more fully in the specification hereinafterfollowmg by reference to the accompanying drawing7 wherein: K-

Figure 1 diagrammatically illustrates a frequency divider circuit embodying the principles kofmy invention; Fig. 2 illustrates a modiedcircuit arrangement constructed according to my invention; Fig. 3 illustrates a further modified form of circuit embodying the principles of my invention; Fig. v4 represents the characteristics of va frequencydivider circuit without the arrangement of shunting capacity employed as part of the circuitv of my invention; and Fig. V5 shows the characteristic of the circuit of my invention with the shunting capacity connected inthe frequency divider circuit according to the principles of my invention.

Referring to the drawing in detail, reference character 1 designates a triode including a cathode 1a, a grid electrode 1b and a plate electrode 1c. The triode is provided with an input circuit 2 and an output circuit 3. YThe input circuit connects between the grid electrode 1b and the cathode 1a, and Vincludes the secondary winding 6 of an input transformer 4, the primary winding 5 of which couples with the secondary winding G-for impressing oscillating energy upon the frequency division system which is to be operated upon by the frequency divisionA circuit. Y The input system is Vcompleted through the "variable resistor 7 which isfshuntedV by the capacity 8.

v I'find that thel inclusion of the capacity -,8

in shunt with the variable resistor 7 'operates'. to stabilizer` thefrequency division circuit. The output circuit 3V of the frequency divider includes the primary windinglO of an audio frequencyV transformer 9, the secondary winding 11 of `which connects in series through the variable condenser 14 across the input circuit2 of the electron tube 1 constituting the'frequency divider system. The output circuit 3 of the frequency divider is Vcompleted through the high potential source12 as shown. The cathodel for the frequency divider tube 1 is heatedfrom suitable source indicated at 16.V The output circuit ofthe frequency divider'connects to the terminals indicated at Vlthrough a suitable coupling condenser as illustrated; The resistance 7 is varied to select the particular division of frequency required for the operation ofthe frequency division circuit.A The resistance is calibrated over a predetermined range in order vto effect the desired change inV frequency for the derivation of a desired submultiple frequency. Thatisfor. an applied frequency of predetermined value at the terminals of the transformer 4,V a submultiple lfrequency is f l derived from the terminals 15 of the output circuit; i

In Fig. 2 of the drawing I have shown a modified circuit arrangement for a frequency division system where the resistance 7 in'- cluded in the'input circuit of the frequency divider is shunted by the condenser 8 which connects across one end of resistance 7 and one end of secondary winding 11 ofthe transformer 9. VBoth the Vresistance 7 and condenser 14 are adjustable to set the frequency divider circuit under a particular condition of frequency division. f

Fig. 3 illustrates a further modified form of -frequencydivision circuit operating in accordance with the principles of my invention where resistance 7 is connected' across the adjustable condenser'14 and-the condenser 8 connected between a point in the input circuit and one end-of' resistance 7. i The condenser-8 functions in the different arrangements illustrated in parallel with the resist-v 5 denser 8 has been illustrated in Fig. 4. The

uncontrolled periods of the frequency divider circuit are illustrated by the portions of the curve indicatedatb while the controlled or stable periods of the frequency divider circuit are designated at a. It will be seen that the time of instability yof the circuit without the condenser 8 in the system is relatively large. ranged in the circuit a lcondition of high Fig. 5, where theuncontrolled periods are extremely short as designated by the vcharacter b as comp-ared to theV longer stable periods of oscillations designated a. It will therefore be seen that the triode frequency divider connected according to the circuit of my invention may be depended upon for stability of operationin which a submultiple frequency is continuously Iderived from the output terminals 15 of the frequency division apparatus for an impressed predetermined frequency on the primary winding 5 and input transformer 4.

While I have described my invention in certain of its preferred embodiments I desire that it be understood that modifications may be made and that no limitations upon my invention are intended otherthan are imposed by the scope ofV the appended claims.

What I claim as new and desire to secure by Letters Patent of the United States is as follows: f

1. A frequency division circuit comprising an electron tube having cathode, grid, and plate electrodes,input and output circuits-interconnecting said electrodes, said input circuit including a pair of branch circuits, one of said branch circuits including inductance and' capacity and the other of said branch circuits including a resistance and a condenser connected in shunt thereto, electromagnetic means coupling one of said branch input circuits tov said output circuit, means for impressing oscillations upon said input circuit, and connections to said outputcircuit for deriving currents of a subinultiple frequency therefrom.

2. A frequency division system comprising an electron tube having cathode, grid, and plate electrodes, an input circuit extending between said grid and cathode, an output circuit connected between said plate and cathode, saidinput circuit including a pair o f branches, one of said branches including a capacity and inductanceand the other of said branches includingaresistance and a capacity connected therewith, said branch including capacity and inductance Aand being 5 coupled to said output circuit, means for'imf pressing oscillations, upon saidinputy circuit,

However with the condenser 8 arstability is obtained as has been illustrated in and means for deriving currents of a submultiple frequency from said output circuit.

3. A frequency division system including an electron tube having cathode, grid and plate electrodes, an input circuit extending between said grid and cathode, an output circuit extending between said, plate and cathode, electromagnetic means coupling said input and output circuits, and means in said input circuit for controlling the operation of said circuits for frequency division comprising a variable resistance and a shunt connected capacity.

4. A frequency division system including anelectron tubehaving cathode, grid and plate electrodes, an input circuit extending between said grid and cathodef an output lcircuit extending between said plate and cathode, electromagnetic means coupling said vinput and output cuits, and means in said input circuit for controlling the operation of saidcircui'ts for frequency division comprising a variable re sistance and al capacityconnected in circuit therewith.

5.l A frequency division circuit including an electron tube having cathode, grid and plate electrodes, input 'and output circuits connected with said electrodes, a low frequency transformer electromagnetically coupling said input and output circuits, said transformer including a pair of windings with one of said windings connected in. series in said output circuit and the other of said windings connected in series with said input circuit, a E

condenser disposed in series with said last mentioned winding, a resistance disposed in said inputgcircuit and electrically connected with said condenser, and an auxiliaryk con- I denserconnected with said. resistance.

o e. A. frequency division eircuitpinciudg an electron tube having cathode, grid' and plate electrodes, input and output circuitsl connected ,with said electrodes, alow frequency transformer electromagnetically coupling said input andoutput circuits, said transformer including a pair of windings with one of said windings connected in series in said loutputcircuit and the other -of said windings connected in series with said input circuit, a condenser disposed in series with said last mentioned winding,ra resistance disposed in said input circuitrand electrically connected with said condenser, and an auxiliary-condenser connected in shunt with said resistance. Y

7. A frequency division circuit including an electron tube having cathode, grid and plate electrodes, input and output vcircuits connected with said electrodes, a low frequency transformer electromagnetically coul-V pling said input and output circuits, said transformer including a pair ofv windings with one of said windings connected in series in said output' circuit and; theother of, said windings connected in series with said input circuit, a condenser disposed in series with said last mentioned winding, a resistance disposed in said input circuit and electricall connected with said condenser, and an auXi iary condenser connected in circuit with said resistance in a series path through said first mentioned condenser.

8. A frequency division circuit comprising an electron tube having cathode, grid, and plate electrodes, an input circuit interconnecting said grid and cathode electrodes, an output circuit interconnecting said plate and cathode, an audio frequency transformer having electromagnetic windings, a source of potential,` a circuit through one of said windings and said source of potential extending between said plate electrode and said cathode, a circuit between the other of said windings, said cathode, and said grid electrode, said last mentioned circuit including a condenser, a resistance connected in shunt with said condenser, and an auxiliary condenser extending between one end Vof said resistance and a point in said input circuit, means for impressing oscillations on said input circuit, and means for deriving a frequency which is a submultiple of the impressed frequency at the output circuit of said frequency divider. e

9. A frequency division circuit comprising an electron tube having, cathode, grid, and plate electrodes, an output circuit interconnecting said plate and cathode, an audio frequency transformer having primary and secondary windings, a source of potential, said output circuit being completed through said primary winding and said source of potential between said plate and cathode, an p input circuit, said input circuit being completed through a pair of parallel connected paths, one of said paths including said secondary winding and a condenser, and the other of said paths including a variable resistor, a condenser connected across one end of said variable resistor and connected to one end of said secondary Winding, means for impressing high frequency oscillations i of predetermined frequency upon one of said parallel paths, and means for deriving a submultiple frequency from the output circuit of said frequency-divider system.

ROBERT M. PAGE. 

